I've never used anything other than Waxed Paper to cover plans, and can't see a reason to use anything else. Its dirt cheap, its readily available at any grocery store, the box is easy to store, and nothing sticks to it. A small piece of masking tape at the corners to hold it in place. There's no reason I can see to want anything to adhere to the plans.

Or are you asking about other materials to use for the monokote decal technique using the Press and Seal?

Brad